"""
两个界面如何跳转
"""
# 二级界面
def menu_2():
    while True:
        print("""
    ============ 查询界面 ============
     1. 查单词   2. 历史记录   3. 注销
    =================================
        """)
        cmd = input("请输入选项:")
        if cmd == "1":
            pass
        elif cmd == "2":
            pass
        elif cmd == "3":
            break
        else:
            print("请输入正确选项！")

# 一级界面
def menu_1():
    while True:
        print("""
    ========== 登录界面 ==========
     1. 登录   2. 注册   3. 退出
    =============================
        """)
        cmd = input("请输入选项:")
        if cmd == "1":
           menu_2()
        elif cmd == "2":
            pass
        elif cmd == "3":
            break
        else:
            print("请输入正确选项！")

if __name__ == '__main__':
    menu_1()
